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Income Taxes - Expiration of Loss and Tax Credit Carryforwards (Detail) $ in Thousands	Dec. 31, 2018 USD ($)
Operating Loss and Tax Credit Carryforward [Line Items]
Loss Carryforwards	$ 662,010
Tax Credit Carryforwards	64,857
Period of Expiration 2019 - 2023
Operating Loss and Tax Credit Carryforward [Line Items]
Loss Carryforwards	8,190
Tax Credit Carryforwards	2,837
Thereafter
Operating Loss and Tax Credit Carryforward [Line Items]
Loss Carryforwards	213,629
Tax Credit Carryforwards	39,871
No expiration date
Operating Loss and Tax Credit Carryforward [Line Items]
Loss Carryforwards	440,191
Tax Credit Carryforwards	$ 22,149